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Finding the Fourth Proportional to 438,961.86, 658,256.88 and 139,361.97

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Solution

The fourth proportional to 438,961.86, 658,256.88 and 139,361.97 is: 208,983.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    438,961.86 : 658,256.88 = 139,361.97 : x
  2. Step 2: Convert to fraction form
    438,961.86/658,256.88 = 139,361.97/x
  3. Step 3: Cross multiply
    438,961.86x = 658,256.88 × 139,361.97
  4. Step 4: Simplify right side
    438,961.86x = 91,735,975,562.85
  5. Step 5: Solve for x
    x = 91,735,975,562.85/438,961.86
  6. Step 6: Final answer
    x = 208,983.93

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.